Mineral insulating oils in electrical equipment. Supervision and maintenance guidanceBS EN 60422: 2006 Mineral insulating oils in electrical equipment. Supervision and maintenance guidance BS EN 60422 gives guidance on the supervision and maintenance of the quality of the insulating oil in electrical equipment. BS EN 60422 applies to mineral insulating oils, originally supplied conforming to BS IEC 60296, and used in transformers, switchgear and other electrical apparatus where oil sampling is reasonably practicable and where the

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